Effect of timing of insemination after CIDR removal with or without GnRH on pregnancy rates in Nili-Ravi buffalo

There are limited studies available on when to inseminate, if using CIDR or CIDR-GnRH protocols for optimal fertility in buffalo. Therefore, the objective of the present study was to determine the optimum time of AI in relation to CIDR removal with or without GnRH in buffalo. All buffalo (n=201) rec...

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Published in:Animal reproduction science 2015-12, Vol.163, p.24-29
Main Authors: Haider, M.S., Hassan, M., Khan, A.S., Husnain, A., Bilal, M., Pursley, J.R., Ahmad, N.
Format: Article
Language:English
Subjects:
Administration, Intravaginal
Animals
Buffalo
Buffaloes - physiology
CIDR
Delayed-Action Preparations
Drug Therapy, Combination
Estrus Synchronization
Female
Gonadotropin-Releasing Hormone - administration & dosage
Gonadotropin-Releasing Hormone - pharmacology
Insemination, Artificial - veterinary
Oligopeptides - administration & dosage
Oligopeptides - pharmacology
Ovulation
Pregnancy
Pregnancy Rate
Progesterone
Time Factors
Timed artificial insemination
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Summary:There are limited studies available on when to inseminate, if using CIDR or CIDR-GnRH protocols for optimal fertility in buffalo. Therefore, the objective of the present study was to determine the optimum time of AI in relation to CIDR removal with or without GnRH in buffalo. All buffalo (n=201) received CIDR on Day 0, PGF2α on Day 6 and CIDR were removed on Day 7. In 50 of these buffalo GnRH was administered 36h after CIDR removal. Furthermore, CIDR (n=151) and CIDR-GnRH (n=50) were randomly divided to receive timed artificial insemination (TAI), either at 48, 60 or 72h after CIDR removal. Ultrasonography was performed for follicular development and for pregnancy diagnosis. The results revealed that, mean interval to ovulation was shorter (P
ISSN:0378-4320
1873-2232
DOI:10.1016/j.anireprosci.2015.09.010